Let-off for looms



Kil)

Patented llielo.k l2.,

Momes ROBERT J. IBARTHOLOMET, OF LANSDLE, AND RGBER'E LA'U'EER, PHCLADELHIA,

PENNSYLVANIA, ASSIGNRS "30 FLETCHEE VIORIIS, INCREORATED, OF DELPHIA, PENNSYLVANA, A COlPP-ATN 'GF PENNSYLVANIA.

PHELAF LET-OFF FUR- LMS.

vApplication filed September 11,192.8'.Y Serial No. 134,775.

'lhis invention relates to an improvement in looms, and has for one ot its objects the provision of an improved letotl.

A turther object et our invention is the provision ot' a letol in which the ina-xinnnn tension may be exerted on the Warp with the minimum in weights on 'the leto'fl' levers.

A still i'urther objectot our invention the provision ot a letotlf in which the brake tension maybe regulated at will within close limi 's and with the minimum ot eiiort.

AAnother object of ein' invention is the provision oit a letoft structure in which the brake bands are quickly detachable, thereby ena,- bling an empty beam to be quickly removed and replaced with a full one.

ln the accoinpanying` drawingl We have illustrated, somewhat diagrammatieally, an embodiment ot our invention.

Referring to this drawing in detail, 1 designates a partially filled Warp beam, the Warp carried thereby beingl designated 2.

3 designates Weighted let-eti7 levers carrying the tension Weights 4. These levers will r be arranged in pairs and are pivoted ath.

Each lever Carries a roller G at the extremity of its short arm 7, the Weights -1 being Carried at the extremity of the long arm 8 ot the lever, or these Weights may be carried on the tie rods 8 by Which the levers are tied together.

Cooperating' with the beam 1 are tivo brake bands 9, one end ot eaeh band beingl anchored at 10. These bralre bands may be of steel, rope, or other suitable material, and preterablylie in grooves on the Warp beam heads.

The :tree `ends 11 of the brake bands are connected to each other bya rod 12 extending lenntlnvise of the vai-p beam,y being' attached to this rod by a quick detznfhahle linll--pin oonnection. This ooniieetion rompi lees a linhr or rod end 13 l'laving one end threaded for a nut. 'l/l lfor arliustinent. and itsA other end'beinp; provided with a hole for the pin 2l. ',lhis pin passes through. both the rod end 13 and the eye in the tree end 11 et the brake band, and may be quickly removed to permit otremoval ot' an empty beam and the insertion oi a full beam.

lntermediate Weighted let-oil' levers 3, and the free ends ott-he brake bands are levers 15. These levers are pivoted at 16 and tied together by the rods 17 and 18. rl-he intermediate levers 15 are bell crank levers and each compmses a long; arm 19 adapted to engage withv the rollers 6 on the letot levers, and a Vshort arm 2O which carries th-e tie rods 1'? ant levers pushing downwardly on the rollers G i carriedy by the short arm r7 ot the levers 3. This tends to raise the long'` arm ot these levers, this tendency being` resisted by the Weights ll. As the beam lets oil the short arm 2O moves away slightly trom the rod 12 to keep the Warps under proper tension.

llt Will be apparentl from the foregoing that We have provided a compound leverage sys-y i tem between the brake bands 9 and Weights 4 wherebyk maximum tension on the `brake bands is obtained with the minimum in Weights on the letol levers. 1. lt will also be apparent that this arrangement permits et the tension on the brake bands being regulated at will Within quite closelimits.

W'hile We have described a specific embodiment of our invention, it is to be understood y that. the same may be varied Within the spirit and scope of our invention, as,or example, it' desired, the rollers (i may be replaced with gear teeth to obtain rolling` Contact between the levers and 19.

llllhat We claim is: i

l. ln a loom, the conibinatimi oi" :i warp beam, a brake therefor, bell eianl lever, the warp on the brak-e bain being' operatively connected to said lever and brake a letotl le` ver operativelyconnected to said lrst nientioned lever, the two levers providii'ig a compound lever system, and a Weight carried by the letoi't lever.

2. In a loom, the combination ot a warpcarrying,v beam, a brake therefor, a `lever pivoted intermediate its endsq one end et said lever being' operatively attached to the Warp and brake, a letoiq lever to which the .opposite end of the `rst mentioned lever 1s operatively 2 from'e oonneood, and a Weight on the and of the leto iovei'` opposite the ond which is connected to the first mentioned level'.

3. A loto for looms, oomQiising in Combination a warp beam, a brake thoe'for, i Weighted leoi ilove?, an intermedia@ level', a rod attached to die brake and Separate from the intormediai@l lever, tho W rp on tho Warp beam being); operatively connoced to the in- 10 tormodiao lever and said rod, *dio intermediate lever cooperating with the weighted leto' lover to control through said o'd die action of Said o on the Warp beam.

This speciicatiou signed this Sth day of Segoinb-ei, 1926.

RO'BE. J. Bi/viP-THQLOMEI This Spociioaiion siglio@ this 8th draf; of Soptember, 192.

ROBERT LAUFER. 

